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DC-DC converter

Current Logic now introduce a new series of DIN rail DC-DC Converter. They can quickly snap onto a DIN rail with built-in DIN rail clips that require no additional brackets.

First made converter in din rail mountable enclosure is a 24V to 12V converter with rated power at 100W (120W max). It is for industrial use and is more tightly regulated than former 24V to 12V converter. The module also has an adjustable output from 11~13V. This give user more convenience in designing their own system.

Current Logic now has a new converter add to non-isolated dc-dc converter family.

48v to 24v converter. This dc-dc converter step down a input of 42-56VDC to 24V output. Like other non-isolated converters from current logic, this switching mode converter have 90%+ effeciency and waterproof casing. Robust and clean design of this module help users to easily plug into their applications.

The 240W module uses more advanced technique and achieve near 95%+ effeciency. Which might be the smallest waterproof converters with such in/out params. Welcome to visit our site to find more info: dc-dc converter

Last year we were asked several times whether we have a water-cooled high power dc-dc solution. Current Logic have been providing air-cooled and fan-cooled dc-dc power supply for years, but didn't have water-cooled units.

After some research, we find many EV/HEV projects have a water-cooled solution for power supply. And we decided to explore the ideas. With help of local institute and talented engineers from partner companies, we came to a dc-dc power solution that is for EV/HEV indeed.

Most featured:
200~450VDC Input
14V/27V Output
Up to 3kW power capacity

The prototype of this module is already been designed-in some EV projects and have quit good results. A standard product will release later this season on current-logic's website.

These converters ranges from 500W to 2000W, they were mostly used in mining and energy industry. Recently, as EV and hybrid powered vehicles drawing more and more attention, they begin to appear in vehicles.

Lower duty converters are more popular with scooters or ebike. We've designed a series of low cost high power dc-dc converters. Unlike the high end converters above, they are non-isolated converters. These non-isolated series already reach a max power of 1200W in customize products.

The current adjustable DC-DC converterin my last post has come out this month. It takes more time to develop than we expected.

The most charming feature of this module is that users can control the output current with potentiometer on board. Current can be set at any number between 750mA ~ 3A, power 2W ~ 100W. This means that user will have most elastic options in different power/current level designs.

We developed 2 types (let's call them A type and B type), whose general function are the same, but also have their own characteristics. Both of them takes 10~30 VDC input, so they can be used both in 12V and 24V applications.

A type: non-isolated, output voltage range=2~30V. Which means that it can power 1 to 10 LEDs, with constant current level set by user. This is module is really nice for its 'universal' character. Waterproof, size=74×73×27mm, weight=320g

B type: isolated, output voltage has to be greater than input, less than 30V. That is, when the input is 12V, output range will be 12~30V. Open frame, size~=60*75*25mm

We also plan to make a isolated A type. But it will depends on whether this existing A is well received by customers.

We have many more constant current modules on the shelf, this 2 are typical for both boost and buck modules.

One interesting project on going is an adjustable constant current DC-DC converter. User can choose the constant current level whenever needed. It is a 12VDC input to 36VDC output module, max current level is 3A.
The mayjor problem will be the case temperature. When the output is 3A, the input half of the module will be above 9A. The module may come out at the end of Sep. I'll post when positive news comes up.

Days ago I received an enquiry asking for a step up dc-dc converter, converting 12v to 24v with 25A output. That is up to 600 Watts. The client was going to use it for radio in Ford cars.

There are plenty company making step down (buck) dc-dc converters, usually reduce 24v/48v to 12v, with maximum 500W output. But a step up (boost) one is not that easy to find, needless to say a 600W one.

In fact, current-logic.com has step up dc-dc converters of 500W. But to increase the output by 100W is not that easy as it may seem. And the most difficult part will be maintian a low temperature.

Normal DC-DC converters for cars operates at -10C to 55C, which is quite sufficient for daily use. But this client require the range to -40C to 70C! This will triple the cost of the product, and price can be as high as 500USD. They are mainly used in industry fields or maybe military vehicles.

So we have to develop a new device to upgrade the normal dc-dc boost converter for cars to meet the needs, but not apply industry grade design. So we can reduce the cost of final product and make it suitable for a car use.

Serial communication bus transmit data through physical network such as the RS-232, RS-485 and Controller Area Network (CAN) . The applications cover industrial process control, power supply regulation (regulators), as well as point-to-point communications between computers.

These interconnected systems are equipped with their own power supply, and the distance between the systems are often far away. For this reason, we often need to take electrical isolation measures to ensure the physical security of the system, and the need to cut off the ground loop to protect system from high voltage surge impact and reduce signal distortion.

Isolation can protect the system from surge or high voltage and high current damage caused by ground loop, which is most likely to occur when there are a number of ground access in the system . The system is connected by a long cable, and their potential to may not be the same, so current will occur between the two systems. If not isolated, this current will cause noise in the system to reduce the measurement accuracy and even destroy system components.

In industrial environment, the motor start-up and shut down, electrostatic discharge or lightning strikes will generate current through the inductive coupling in the long-distance cables, causing potential rapid change. Such changes can be up to hundreds of kilovolts. If there is no isolation measures taken, the signal or even the system will be damaged. If all the devices connected to bus share the same reference ground, then the system will be free from the impact of this destructive energy, and the isolation between devices can prevent ground loops and the occurrence of surge.

CAN bus typically uses a working voltage of 3V or 5V. In certain areas of industrial control, due to the complexity of the situation, there is high common-mode voltage between each node. Although the CAN bus has a certain anti-interference ability of common interference. However, when the common-mode voltage is higher than the threshold voltage of the receiver, the receiver can not work on, or even chips and equipments will be burned.

In order to achieve complete isolation of systems, all signal lines and power supplies must be isolated. Using isolated DC / DC converter can provide power supply isolation. Current-logic.com offers a wide selection of low cost miniature power DC-DC Converter from 0.1 watt to 2 watts.

Here are some pics of the low-voltage converter that I created using the National Semiconductor LM2576HVT-12-ND buck-converter. The chip pretty much did everything for me -- all I had to do was to add two power-smoothing caps, a blocking diode, and a RF choke (which I mistaking undersized; promptly blew up and which I jerry rigged a loop of wire).

In the top left of the photo above, you will also note my premade, off the shelf 12VDC to 5VDC converter. This powers my LED headlights.

The following photo is the back side. Please note that I am a really lousy solderer. The LM2576HVT-12-ND will take any input from 16-75VDC and output a steady 12VDC @ 3A continuous but they mention that with active cooling it could do 5A continuous. That's 36-60 watts, plenty for me.

This is the wiring schematic that I used:

Top side again. The setup is small enough that my ESC and UBEC still fit in the project case with plenty of space for airflow -- and for another DC-DC converter to fit in there in case 3~5A is not enough.

The resulting low-voltage converter and ESC "mounted" on my bike with duct tape. This is an older photo, I've reduced some of the wiring and since changed the SB50 connector to a PowerPole 45.